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48 208143 REV - Operations Manual, HPA3, Mini Compact Outdoor SSPA
5.1.2 Spurious
Spurious signals are undesirable byproducts of amplifiers caused by nonlinearities within the
amplifier and other system level components such as switch mode power supplies. These
unwanted signals cause signal management problems in system applications. Out of band
spurious signals cause interference to other pieces of equipment. See Figure 5-1, Item [2].
5.1.3 Input Return Loss
The input return loss is measured in all production amplifiers. This is a measure of how
closely the amplifier is matched to its characteristic impedance. The input impedance of the
amplifier is a nominal 50Ω. See Figure 5-2, Item [1].
5.1.4 Output Return Loss
The output return loss is measured in all production amplifiers. This is a measure of how
closely the amplifier is matched to its characteristic impedance. The output impedance of the
amplifier is matched to the waveguide complex impedance. See Figure 5-2, Item [2].
Figure 5-2: Return Loss, Intermodulation and Phase Noise Data
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